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build: detect the host triplet once per build

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The top-level Makefile calls itself for prereq and for the build, and
every call runs config.guess again. config.guess runs the host C
compiler three times, which takes about 40 ms.

Take GNU_HOST_NAME from the environment in recursive calls, as for
REVISION and SOURCE_DATE_EPOCH.

Signed-off-by: John Crispin <john@phrozen.org>
This commit is contained in:
John Crispin committed 2026-09-22 18:18:58 +02:00
1 parent 177325ba1a
commit e3a89c4e4b
1 file changed
+4 -1
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include/toplevel.mk
+4 -1
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@@ -22,7 +22,10 @@ export SOURCE_DATE_EPOCH
export GIT_CONFIG_PARAMETERS='core.autocrlf=false'
export GIT_ASKPASS:=/bin/true
export MAKE_JOBSERVER=$(filter --jobserver%,$(MAKEFLAGS))
export GNU_HOST_NAME:=$(shell $(TOPDIR)/scripts/config.guess)
ifneq ($(filter-out 0,$(MAKELEVEL))$(origin GNU_HOST_NAME),$(MAKELEVEL)environment)
GNU_HOST_NAME:=$(shell $(TOPDIR)/scripts/config.guess)
endif
export GNU_HOST_NAME
export HOST_OS:=$(shell uname)
export HOST_ARCH:=$(shell uname -m)